Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
lam loc » lam duoc, lam ngoc
va xanh » va danh, va hanh, va anh
xanh di » danh di, vanh dai, xanh tai
cu tren » tu tren, dua tren
y nang » ky nang, ly nang, may nang
v nang » va nang, vu nang, van nang
va lam » van lam, va lap
loc va » hoc va, luc va
di cu » di cau, di cua, di du

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ((y nang) or (v nang)) xa hoi. hieu va lam loc va xanh di cu tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((y nang) OR (v nang)) xa hoi. hieu va lam loc va xanh di cu tren.
• Adding a wildcard symbol may retrieve word variants: tu sach ((y nang) or (v nang)) xa hoi. hieu va lam loc va xanh di cu tren*.